中文摘要：

E-mail：zhh1980@fudan．edu．cn Zhen-Hua Huang received the B.Sc. and M.Sc. degrees in computer science from Xiamen University, Fujian, China. He is currently working toward the Ph.D. degree in computer science at Fudan University, Shanghai, China. His research interest is database systems, with emphasis on query processing and optimization. He is a student member of China Computer Federation. Jian-Kui Guo received the B.Sc. degree in computer science from Fuzhou University, Fujian, China, and the M.Sc. degree from Fudan University, Shanghai, China. He is currently working toward the Ph.D. degree in computer science at Fudan University, Shanghai, China. His research interests are web mining and data stream query. Sheng-Li Sun received the B.Sc. and M.Sc. degrees in computer science from Peking University, Beijing, China. He is currently working toward the Ph.D. degree in computer science at Fudan University, Shanghai, China. His research interests are data stream mining and query optimization. Wei Wang received the M.Sc. degree in 1992 and the Ph.D. degree in 1998. Now he is a professor and Ph.D. supervisor of the Department of Computer Science, Fudan University, Shanghai, China. He is a senior member of China Computer Federation. His main research areas include spatial-temporal database, constraint database, index technology and semistructure database.